Johannasburg Sinkhole Opens after Tunnel Collapse
Failures
Subway Tunnel Collapse in Cologne Germany
Early indications are that a collapse of a subway tunnel station still under construction was to blame for the sinkhole that destroyed Cologne’s Historical Archive, home to documents dating back to 922 A.D. More info after the break. (Photo by DPA via Spiegel Online)
Geologic Hazards
Sinkhole Beneath National Corvette Museum Devours 8 Cars
A 40 foot diameter sinkhole 30 feet deep opened up beneath the National Corvette Museum in Bowling Green, Kentucky, and swallowed 8 of the Corvettes on display. The museum’s security company alerted the staff members […]
Geologic Hazards
Maitland Sinkhole Stabilization Project – Central Florida
A massive sinkhole more than 300-ft in diameter and with depths to bedrock of up to 350-ft is located under a future I-4 traffic interchange in an Orlando suburb. A massive $9 million stabilization project is underway to prepare the site for the eventual TI construction. The size of the Maitland Sinkhole is on par with the largest sinkholes to form in central Florida in recent times. There is not a void present, instead it is infilled with a compressible sand deposit. (Image from FDOT)
The mitigation method includes drilling over 300 grout injection holes, and performing grouting operations to infill cracks in the limestone bedrock. Then in the same holes, compaction grouting will be used as a method of ground improvement to densify the sand in place. Once the grouting is complete, the site will be surcharged to compress any remaining weak layers. Click through for a subsurface profile and location map. Via ASCE SmartBrief.